DTC C0049:85 [VEHICLE CONTROL MODULE]

id1502c5033500

Outline

System malfunction location

Inappropriate brake fluid level

Detection condition

•  The vehicle control module (VCM) receives a brake fluid error signal from the electronically controlled brake unit for 5 s.

Fail-safe

(See DTC TABLE [VEHICLE CONTROL MODULE].)

Possible cause

•  Electronically controlled brake unit malfunction

―  Brake fluid level malfunction

•  Brake fluid level sensor connector or terminals malfunction

•  Brake fluid level sensor malfunction

•  Vehicle control module (VCM) malfunction (built into body control module (BCM))

System wiring diagram

Not applicable

Connector diagram

Not applicable

System malfunction location	Inappropriate brake fluid level
Detection condition	• The vehicle control module (VCM) receives a brake fluid error signal from the electronically controlled brake unit for 5 s.
Fail-safe	(See DTC TABLE [VEHICLE CONTROL MODULE].)
Possible cause	• Electronically controlled brake unit malfunction ― Brake fluid level malfunction • Brake fluid level sensor connector or terminals malfunction • Brake fluid level sensor malfunction • Vehicle control module (VCM) malfunction (built into body control module (BCM))
System wiring diagram	Not applicable
Connector diagram	Not applicable

Diagnostic Procedure

Step

Inspection

Results

Action

1

INSPECT VEHICLE CONTROL MODULE (VCM) AND BODY CONTROL MODULE (BCM) FOR MALFUNCTION

•  Perform the DTC inspection for the vehicle control module (VCM) and the body control module (BCM).
(See DTC INSPECTION.)

•  Is a DTC related to an internal malfunction of vehicle control module (VCM) or body control module (BCM) displayed?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

(See DTC TABLE [VEHICLE CONTROL MODULE].)

(See DTC TABLE [BODY CONTROL MODULE (BCM)].)

No

Go to the next step.

2

VERIFY BRAKE FLUID LEVEL

•  Inspect the brake fluid level.
(See BRAKE FLUID INSPECTION.)

•  Is the brake fluid level normal?

Yes

Go to the next step.

No

Add genuine brake fluid and perform the repair completion verification.

3

INSPECT BRAKE FLUID LEVEL SENSOR CONNECTOR FOR MALFUNCTION

•  Inspect the applicable connector and terminal.
(See CONNECTOR INSPECTION.)

•  Are the connector and terminal normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

4

INSPECT BRAKE FLUID LEVEL SENSOR FOR MALFUNCTION

•  Inspect the applicable part.
(See BRAKE FLUID LEVEL SENSOR INSPECTION.)

•  Is the part normal?

Yes

Go to the next step.

No

Replace the Electronically controlled brake unit and perform the repair completion verification.

(See ELECTRONICALLY CONTROLLED BRAKE UNIT REMOVAL/INSTALLATION.)

5

INSPECT ELECTRONICALLY CONTROLLED BRAKE UNIT FOR MALFUNCTION

•  Perform the DTC inspection for the electronically controlled brake unit.
(See DTC INSPECTION.)

•  Is a DTC displayed?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

(See DTC TABLE [ELECTRONICALLY CONTROLLED BRAKE UNIT].)

No

Go to the next step.

6

INSPECT ELECTRONICALLY CONTROLLED BRAKE UNIT FOR MALFUNCTION DEPENDING ON REPEATABILITY

•  Install/connect the part removed/disconnected during the troubleshooting procedure.

•  Clear the DTC recorded in the memory.
(See CLEARING DTC.)

•  Switch the ignition ON (engine off or on) and wait for 5 s or more.

•  Perform the DTC inspection for the vehicle control module (VCM).
(See DTC INSPECTION.)

•  Is the same Pending DTC present?

Yes

Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.

(See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW.)

If the CAN communication is normal, replace the electronically controlled brake unit and perform the repair completion verification.

(See ELECTRONICALLY CONTROLLED BRAKE UNIT REMOVAL/INSTALLATION.)

No

Perform the [ACTION FOR NON-REPEATABLE MALFUNCTIONS].

(See TROUBLESHOOTING PROCEDURE [(E)].)

If DTC is displayed

•  Repeat the diagnosis from Step 1.

If DTC is not displayed

•  Go to repair completion verification 2.

Repair completion verification 1

VERIFY THAT VEHICLE IS REPAIRED

•  Install/connect the part removed/disconnected during the troubleshooting procedure.

•  Clear the DTC recorded in the memory.
(See CLEARING DTC.)

•  Switch the ignition ON (engine off or on) and wait for 5 s or more.

•  Perform the DTC inspection for the vehicle control module (VCM).
(See DTC INSPECTION.)

•  Is the same Pending DTC present?

Yes

Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.

(See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW.)

If the CAN communication is normal, perform the diagnosis from Step 1.

•  If the malfunction recurs, replace the body control module (BCM), then go to the next step.
(See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)

No

Go to the next step.

Repair completion verification 2

VERIFY IF OTHER DTC IS DISPLAYED

•  Perform the DTC inspection.
(See DTC INSPECTION.)

•  Are any other DTCs displayed?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

No

DTC troubleshooting completed.

Step	Inspection	Results	Action
1	INSPECT VEHICLE CONTROL MODULE (VCM) AND BODY CONTROL MODULE (BCM) FOR MALFUNCTION • Perform the DTC inspection for the vehicle control module (VCM) and the body control module (BCM). (See DTC INSPECTION.) • Is a DTC related to an internal malfunction of vehicle control module (VCM) or body control module (BCM) displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [VEHICLE CONTROL MODULE].) (See DTC TABLE [BODY CONTROL MODULE (BCM)].)
1		No	Go to the next step.
2	VERIFY BRAKE FLUID LEVEL • Inspect the brake fluid level. (See BRAKE FLUID INSPECTION.) • Is the brake fluid level normal?	Yes	Go to the next step.
2		No	Add genuine brake fluid and perform the repair completion verification.
3	INSPECT BRAKE FLUID LEVEL SENSOR CONNECTOR FOR MALFUNCTION • Inspect the applicable connector and terminal. (See CONNECTOR INSPECTION.) • Are the connector and terminal normal?	Yes	Go to the next step.
3		No	Repair or replace the malfunctioning location and perform the repair completion verification.
4	INSPECT BRAKE FLUID LEVEL SENSOR FOR MALFUNCTION • Inspect the applicable part. (See BRAKE FLUID LEVEL SENSOR INSPECTION.) • Is the part normal?	Yes	Go to the next step.
4		No	Replace the Electronically controlled brake unit and perform the repair completion verification. (See ELECTRONICALLY CONTROLLED BRAKE UNIT REMOVAL/INSTALLATION.)
5	INSPECT ELECTRONICALLY CONTROLLED BRAKE UNIT FOR MALFUNCTION • Perform the DTC inspection for the electronically controlled brake unit. (See DTC INSPECTION.) • Is a DTC displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [ELECTRONICALLY CONTROLLED BRAKE UNIT].)
5		No	Go to the next step.
6	INSPECT ELECTRONICALLY CONTROLLED BRAKE UNIT FOR MALFUNCTION DEPENDING ON REPEATABILITY • Install/connect the part removed/disconnected during the troubleshooting procedure. • Clear the DTC recorded in the memory. (See CLEARING DTC.) • Switch the ignition ON (engine off or on) and wait for 5 s or more. • Perform the DTC inspection for the vehicle control module (VCM). (See DTC INSPECTION.) • Is the same Pending DTC present?	Yes	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW.) If the CAN communication is normal, replace the electronically controlled brake unit and perform the repair completion verification. (See ELECTRONICALLY CONTROLLED BRAKE UNIT REMOVAL/INSTALLATION.)
6		No	Perform the [ACTION FOR NON-REPEATABLE MALFUNCTIONS]. (See TROUBLESHOOTING PROCEDURE [(E)].) If DTC is displayed • Repeat the diagnosis from Step 1. If DTC is not displayed • Go to repair completion verification 2.
Repair completion verification 1	VERIFY THAT VEHICLE IS REPAIRED • Install/connect the part removed/disconnected during the troubleshooting procedure. • Clear the DTC recorded in the memory. (See CLEARING DTC.) • Switch the ignition ON (engine off or on) and wait for 5 s or more. • Perform the DTC inspection for the vehicle control module (VCM). (See DTC INSPECTION.) • Is the same Pending DTC present?	Yes	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW.) If the CAN communication is normal, perform the diagnosis from Step 1. • If the malfunction recurs, replace the body control module (BCM), then go to the next step. (See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)
Repair completion verification 1		No	Go to the next step.
Repair completion verification 2	VERIFY IF OTHER DTC IS DISPLAYED • Perform the DTC inspection. (See DTC INSPECTION.) • Are any other DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting.
Repair completion verification 2		No	DTC troubleshooting completed.